Thanks LSHorwitz1 for your comments and photo. That photo looks quite sharp and vibrant.... I can see why you're happy with this lens.

I've read comments in another forum which stated that if you were to buy this lens (I'm seriously considering it), then you would miss the extra "mm" at the long end. Since this lens only goes to 16 mm, are any of you finding this comment to be relevant? I guess not so for those upgrading/switching from the Tokina, but for those who are switching from Canon or other Sigma's..... any comment?